I am fairly new to PHP although I have done quite a bit html/vbscript etc. I am putting together a page that will take user input and calculate a value from this. What I want to know is what is the best way of:
a. determining whether the page is being viewed for the first time or whether it has been resubmitted
b. keeping values entered into list boxes after resubmission
HTML checkboxes provide the perfect way for a web developer to receive client input when the client's options might be none, one or many. But the PHP code for processing the checkboxes can be confusing at first. What if a checkbox is…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions.
Consider email address RFCs:
Look at HTML5 form input element (with type=email) regex pattern: